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fbdev: mm: Deferred IO support

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This implements deferred IO support in fbdev.  Deferred IO is a way to delay
and repurpose IO.  This implementation is done using mm's page_mkwrite and
page_mkclean hooks in order to detect, delay and then rewrite IO.  This
functionality is used by hecubafb.

[adaplas]
This is useful for graphics hardware with no directly addressable/mappable
framebuffer. Implementing this will allow the "framebuffer" to be accesible
from user space via mmap().

Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jaya Kumar 2007-05-08 00:37:37 -07:00 • committed by Linus Torvalds
parent 3a2842480b
commit 60b59beafb
6 changed files with 239 additions and 0 deletions
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1
mm/rmap.c
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@ -505,6 +505,7 @@ int page_mkclean(struct page *page)
return ret;
}
EXPORT_SYMBOL_GPL(page_mkclean);
/**
* page_set_anon_rmap - setup new anonymous rmap